Samsung

Depending on the phone model, go to the smartphone's settings and follow these steps:

1. Tap on "Applications" or "Apps"
2. Tap on the three-dot menu (top right corner)
3. Tap on "Special Access"
4. Tap on "Optimize Battery usage"

OR

1. Tap on "Device maintenance"
2. Tap on "Battery"
3. Tap on "Battery Usage"
4. Tap on the three-dot menu (top right corner)
5. Tap on "Optimize Battery usage"

On the "Optimize Battery" screen, if the Callharbor app is not listed as “Apps Not Optimized”, tap on "Apps not optimized" and then tap on "All apps". Search for "Callharbor" and disable that option.
 

Google Pixel

1. Go to your smartphone's Settings
2. Tap on "Apps & notifications"
3. Tap on "Advanced"
4. Tap on "Special app access"
5. Tap on "Battery optimization"

If the Callharbor app is not listed as “Not Optimized”, tap on "Not optimized" and then tap on "All Apps". Search for "Callharbor" and tap on it, and then tap on "Don't Optimize".

Sony

1. Go to your smartphone's Settings
2. Tap on "Battery"
3. Tap on the (...) menu in the top right corner and press "Battery optimization"
4. Tap on "Apps"
5. Tap on "Callharbor".

LG

1. Go to your smartphone's Settings
2. Tap "Battery & power saving"
3. Tap on "Battery usage"
4. Tap "Ignore optimizations"
5. Turn "on" to ignore battery optimization for the Callharbor app.

One Plus

1. Go to Settings.
2. Tap on "Battery"
3. Tap on "Battery optimization"
4. Switch to the "All apps list" (top menu)
5. Tap on Callharbor and choose "Don’t optimize"
6. Go back to your smartphone Settings
7. Select "Apps & notifications"
8. Tap on "See all apps"
9. Tap on the Callharbor app
10. Then "Permissions"
11. Toggle "on" for Location access

Motorola

1. Go to your smartphone's Settings
2. Tap "Battery"
3. Tap on the menu in the top right corner
4. Tap "Battery optimization"
5. Tap "Not optimized"
6. Tap "All Apps"
7. Find Callharbor on this list and tap on "Don’t Optimize".
8. Go back to your phone settings*
9. Select "Battery"*
10. Turn Battery Saver Mode off*

* When your Motorola reaches a low level of battery (15% by default, though you can customize it), the battery saver mode automatically starts and ignores the battery optimization setting you've chosen previously, so steps 8, 9, and 10 are advisable.